doc13 Priority Rivers for Alien Fish Eradication
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13 Priority Rivers for Alien Fish Eradication
13 Priority Rivers for Alien Fish Eradication Riaan van der Walt Dean Impson Martine Jordaan 30 May 2013 1. Native species • • • • • Clanwilliam sandfish E Clanwilliam yellowfish V Clanwilliam sawfin E Clanwilliam redfin V Cape galaxias DD 1. Biedouw River 2. Alien species • • spotted bass smallmouth bass 3. Barrier • Funding for EIA 2013/2014 4. Other threats • • Alien vegetation Water abstraction 5. Conservation initiatives • • • Awareness with landowners Sandfish BMPS Possible alien clearing project – Wupperthal Native fish upper limit 6. Rehabilitation area • 2 km, needs alien veg. clearing Alien fish upper limit Biedouw River, Cederberg Biedouw River, Cederberg 2. Jan Dissels River 1. Native species • • • • • • Clanwilliam yellowfish V Clanwilliam sawfin E Clanwilliam redfin V Clanwilliam rock catfish V (spotted) Cape galaxias V Fiery redfin (extirpated) 2. Alien species • • • smallmouth bass Bluegill sunfish Banded tilapia 3. Barrier • Owner willing to erect and fund barrier 4. Other threats • Alien vegetation 5. Conservation initiatives • Catchment in Cederberg wilderness 6. Rehabilitation area • 6 km near pristine wilderness Alien fish upper limit Native fish upper limit 1. Native species • • • • • • 3. Heks River Spotted rock catfish E Clanwilliam rock catfish V Clanwilliam yellowfish V Fiery redfin E Clanwilliam redfin V Cape galaxias DD 2. Alien species • smallmouth bass 3. Barrier • Funding required 4. Other threats • Alien vegetation 5. Conservation initiatives • Catchment: Cederberg Wilderness 6. Rehabilitation area • 7-10 km pristine habitat Native fish upper limit Alien fish upper limit 1. Native species • • • • • • Doring redfin CR Clanwilliam yellowfish V Clanwilliam sawfin E Clanwilliam redfin V Chubbyhead barb DD Cape galaxias DD 4. Breekkrans River 2. Alien species • • spotted bass smallmouth bass 3. Barrier • Funding for EIA 2013/2014 4. Other threats • Fire ? 5. Conservation initiatives • • Stewardship site Catchment: Cape Mountain Club and Cederberg Wilderness 6. Rehabilitation area • 3-4 km pristine habitat Native fish upper limit Alien fish upper limit Breekkrans River, Cederberg 1. Native species • • Twee River redfin CR Twee River galaxias DD 2. Alien species • • • • largemouth bass (dam) Bluegill sunfish Cape kurper (below waterfall) Clanwilliam yellowfish (below waterfall) 3. Barrier • Barrier at Suurvlei planned 2014/2015 Working for Wetlands 4. Other threats • • Agricultural pollution and water abstraction Alien vegetation 5. Conservation initiatives • • Alien clearing proposal WWF Green Trust Part of Cape Critical Rivers Project: EWT 5. Twee River 1. Native species • • Twee River redfin CR Twee River galaxias DD 2. Alien species • • • • largemouth bass (dam) Bluegill sunfish Cape kurper (below waterfall) Clanwilliam yellowfish (below waterfall) 3. Barrier • Natural waterfall at De Straat but none lower down 4. Other threats • • Agricultural pollution and water abstraction Hex River only sanctuary 5. Conservation initiatives • • • Catchment: Hexberg NR and Tandfontein PNR Awareness WWF Greentrust 6. Middeldeur 1. Native species • • • Verlorenvlei redfin CR Cape galaxias x2 Cape kurper DD 2. Alien species • • • largemouth bass Bluegill sunfish Banded tilapia 3. Barrier • • Funding needed Temporary barriers, phased 4. Other threats • • Agricultural pollution and water abstraction Mining for tungsten 5. Conservation initiatives • • Alien clearing by Working for Wetlands Awareness from mining threat 7. Krom Antonies 8. Krom River 1. Native species • Giant redfin CR 2. Alien species • • smallmouth bass Rainbow trout 3. Barrier • Funding required 4. Other threats • recreation 5. Conservation initiatives • • Catchment in Limietberg NR CPS assistance Native fish upper limit Alien fish upper limit 1. Native species • • • • Giant redfin CR Cape kurper DD Breede redfin LC Cape galaxias V 2. Alien species • • • smallmouth bass ? Bluegill sunfish ? Sharptooth catfish ? 3. Barrier • Funding required to create sanctuary 4. Other threats • Alien vegetation 5. Conservation initiatives • Hottentots Holland NR 9. Upper Riviersonderend 10. Kars River 1. Native species • • • Heuningnes redfin CR Cape kurper DD Cape galaxias DD 2. Alien species • • spotted bass Bluegill sunfish 3. Barrier • Funding required 4. Other threats • • Alien vegetation Water abstraction 5. Conservation initiatives • none Native fish upper limit Alien fish upper limit 1. Native species • • • Heuningnes redfin CR Cape kurper DD ? Cape galaxias DD 2. Alien species • • spotted bass Bluegill sunfish 3. Barrier • Funding required 4. Other threats • • • Alien vegetation Water abstraction Habitat degradation 5. Conservation initiatives • Agulhas Biodiversity Initiative 11. Poort River 12. Tradou River 1. Native species • Tradou redfin CR 2. Alien species • • • Largemouth bass Bluegill sunfish Banded tilapia 3. Barrier • funding required 4. Other threats • • • Alien vegetation Water abstraction Water pollution 5. Conservation initiatives • Draft BMP and SOS project 1. Native species • Tradou redfin CR 2. Alien species • • • largemouth bass Bluegill sunfish Banded tilapia 3. Barrier • Funding required 4. Other threats • • • Alien vegetation Water abstraction Water pollution 5. Conservation initiatives • BMP and SOS project 13. Huis River Thanks
